Whistle



FIG. 1 is a perspective view of the whistle of the design of the subject invention;

FIG. 2 is a side elevational view thereof, with the opposite side being a mirror image, and with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 3 is a rear plan view of the personal protection whistle of FIG. 1;

FIG. 4 is a front plan view of the personal protection whistle of FIG. 1;

FIG. 5 is a top plan view of the personal protection whistle of FIG. 1; and,

FIG. 6 is a bottom plan view of the personal protection whistle of FIG. 1. 

The ornamental design for a whistle, as shown and described. 